1 /*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996,1999 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id: inet_neta.c,v 1.3 2005/04/27 04:56:20 sra Exp $";
20 #endif
21 #include <sys/cdefs.h>
22 __FBSDID("$FreeBSD$");
23
24 #include "port_before.h"
25
26 #include <sys/types.h>
27 #include <sys/socket.h>
28 #include <netinet/in.h>
29 #include <arpa/inet.h>
30
31 #include <errno.h>
32 #include <stdio.h>
33 #include <string.h>
34
35 #include "port_after.h"
36
37 #ifdef SPRINTF_CHAR
38 # define SPRINTF(x) strlen(sprintf/**/x)
39 #else
40 # define SPRINTF(x) ((size_t)sprintf x)
41 #endif
42
43 /*%
44 * char *
45 * inet_neta(src, dst, size)
46 * format an in_addr_t network number into presentation format.
47 * return:
48 * pointer to dst, or NULL if an error occurred (check errno).
49 * note:
50 * format of ``src'' is as for inet_network().
51 * author:
52 * Paul Vixie (ISC), July 1996
53 */
54 char *
inet_neta(in_addr_t src,char * dst,size_t size)55 inet_neta(in_addr_t src, char *dst, size_t size)
56 {
57 char *odst = dst;
58 char *tp;
59
60 while (src & 0xffffffff) {
61 u_char b = (src & 0xff000000) >> 24;
62
63 src <<= 8;
64 if (b) {
65 if (size < sizeof "255.")
66 goto emsgsize;
67 tp = dst;
68 dst += SPRINTF((dst, "%u", b));
69 if (src != 0L) {
70 *dst++ = '.';
71 *dst = '\0';
72 }
73 size -= (size_t)(dst - tp);
74 }
75 }
76 if (dst == odst) {
77 if (size < sizeof "0.0.0.0")
78 goto emsgsize;
79 strcpy(dst, "0.0.0.0");
80 }
81 return (odst);
82
83 emsgsize:
84 errno = EMSGSIZE;
85 return (NULL);
86 }
87
88 /*
89 * Weak aliases for applications that use certain private entry points,
90 * and fail to include <arpa/inet.h>.
91 */
92 #undef inet_neta
93 __weak_reference(__inet_neta, inet_neta);
94
95 /*! \file */
96